QUiLoader:使用自定义小部件加载.ui文件的要求? [英] QUiLoader: requirements for loading .ui file with custom widgets?
问题描述
我使用Qt5-Designer创建了一个UI,通过调用
I've created a UI using Qt5-Designer which I load at runtime by calling
QUiLoader().load(qfile_object, this);
像charm一样工作,但现在我提升了一些 QLabel
元素到小部件类 MyQLabel
与从 QLabel
派生。
Works like charm but now I've promoted some QLabel
elements to a widget class MyQLabel
with is derived from QLabel
.
当我现在尝试加载UI时,我会为每个已推广的窗口小部件发出警告:
When I now try to load the UI I get a warning for each promoted widget:
"QFormBuilder was unable to create a custom widget of the class 'MyQLabel'; defaulting to base class 'QLabel'."
类如下所示:
class MyQLabel : public QLabel {
Q_OBJECT
public:
MyQLabel(QWidget *parent = nullptr) : QLabel(parent) {}
};
已经自动 - moc
链接到我的可执行文件。
It's been auto-moc
'ed and linked against my executable.
我有一种感觉,不知怎的,我必须告诉 QUiLoader
使用它,但我不知道如何..
I have the feeling that somehow I have to tell QUiLoader
about my class before trying to use it but I don't know how..
我必须为此创建一个插件吗?有没有办法重现, QUiLoader
会检查它吗?
Do I have to create a plugin for this? Is there a way to reproduce, what to QUiLoader
does to examine it?
推荐答案
您需要创建自己的导出版本 QUiLoader
,并提供工厂方法的实现 QUiLoader :: createWidget $ c $
You need to create your own derived version of QUiLoader
, and provide an implementation of the factory method QUiLoader::createWidget
that can create your widgets.
您可以将这个因素导入一个由 QUiLoader
。它必须实施 QDesignerCustomWidgetInterface
实例。有关插件的完整示例,请参见自定义小部件插件示例 。
You could factor this out into a plugin that gets loaded by the QUiLoader
. It would have to implement a QDesignerCustomWidgetInterface
instance. See the Custom Widget Plugin Example for a complete example of a plugin.
// https://github.com/KubaO/stackoverflown/tree/master/questions/uiloader-custom-37775472
#include <QtUiTools>
#include <QtWidgets>
const char uiData[] =
"<ui version=\"4.0\"><class>Widget</class><widget class=\"MyWidget\" name=\"Widget\">\n"
"<property name=\"windowTitle\" ><string>Widget</string></property>\n"
"</widget><pixmapfunction></pixmapfunction><resources/><connections/>\n"
"</ui>";
class MyWidget : public QLabel
{
Q_OBJECT
bool m_closed = false;
public:
MyWidget(QWidget* parent = 0) : QLabel("This is MyWidget", parent) {}
bool isClosed() const { return m_closed; }
void closeEvent(QCloseEvent *) Q_DECL_OVERRIDE { m_closed = true; }
};
class MyUiLoader : public QUiLoader {
public:
MyUiLoader(QObject * parent = 0) : QUiLoader(parent) {}
QWidget * createWidget(const QString & className, QWidget * parent = 0,
const QString & name = QString()) {
if (className == "MyWidget") {
MyWidget * w = new MyWidget(parent);
w->setObjectName(name);
return w;
}
return QUiLoader::createWidget(className, parent, name);
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QBuffer buf;
buf.setData(uiData, sizeof(uiData));
MyUiLoader uiLoader;
auto uiMain = qobject_cast<MyWidget*>(uiLoader.load(&buf));
uiMain->show();
return app.exec();
}
#include "main.moc"
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